depth sounder

noun

1. an instrument for determining depths under water, especially under a ship.

Example Sentences

That is until diver Bernie Hellstrom, 63, of Boyne City, Michigan, came across to an obstruction on his depth sounder about 200 feet down to the bottom of Lake Michigan near Beaver Island about 10 years ago.

From Fox News

Bernie Hellstrom of Boyne City, Mich., said he was looking for shipwrecks about 10 years ago when a depth sounder on his boat noted a large obstruction about 200 feet down on the lake bottom near Beaver Island.

From Los Angeles Times

Paden himself helped develop the signal processing software for the radar system, which was dubbed the Multichannel Coherent Radar Depth Sounder, or MCoRDS.

From Washington Times

He’d brought a depth sounder and a salinity meter, a long stick for testing the bay bottom.

From New York Times

Among much else, he suggested the method that led directly to the invention of refrigeration, devised the scale of absolute temperature that still bears his name, invented the boosting devices that allowed telegrams to be sent across oceans, and made innumerable improvements to shipping and navigation, from the invention of a popular marine compass to the creation of the first depth sounder.

From Literature